Adjustable dog collar



FIG. 1 is a front elevational view of an adjustable dog collar showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top elevational view thereof;

FIG. 4 is a bottom elevational view thereof;

FIG. 5 is an isometric elevational view thereof; and,

FIG. 6 is an in use view of the device.

The broken line showing of a dog illustrates environmental use, and is not claimed. 

CLAIM The ornamental design for adjustable dog collar, as shown and described. 